A. Disable OSPF for IPv4 using the no ospfv3 4 area 0 ipv4 command under the E 0/0 interface.
B. Enable the IPv4 address family under the router ospfv3 4 process by using the address-family ipv4 unicast command.
C. Disable IPv6 on the E 0/0 interface using the no ipv6 enable command.
D. Enable the IPv4 address family under the E 0/0 interface by using the address-family ipv4 unicast command.